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glow-worm space-saver boiler over boils?

when i switch the heating on it heats up then starts boiling and causing condensation and water dripping from the attic
nic, November 2006
the boiler thermostat has failed. the water dripping from the attic is from the feed and expansion tank which you boiler is filling with boiling hot water.

Paul, November 2006
link Click here to see other fixes for Glow-Worm.